text: /**
   * Repeats the given string `n` times.
   * copy from lodash.repeat
   * @since 3.0.0
   * @category String
   * @param {string} [string=''] The string to repeat.
   * @param {number} [n=1] The number of times to repeat the string.
   * @returns {string} Returns the repeated string.
   * @example
   *
   * repeat('*', 3)
   * // => '***'
   *
   * repeat('abc', 2)
   * // => 'abcabc'
   *
   * repeat('abc', 0)
   * // => ''
   */
  function repeat(string, n) {
    let result = ''
    if (!string || n < 1 || n > Number.MAX_SAFE_INTEGER) {
      return result
    }
    // Leverage the exponentiation by squaring algorithm for a faster repeat.
    // See https://en.wikipedia.org/wiki/Exponentiation_by_squaring for more details.
    do {
      if (n % 2) {
        result += string
      }
      n = Math.floor(n / 2)
      if (n) {
        string += string
      }
    } while (n)
  
    return result
  }
  
  /* 慢
  function repeat(string, n) {
    return new Array(n + 1).join(string)
  }
  */
  
  export default repeat